gobutton
nounUK /ˈɡəʊˌbʌtən/
US /ˈɡoʊˌbʌtən/
A gobutton is a button you press to make something start.
Press the gobutton to start the toy train.
OTHER MEANINGS
2. A big round button on a toy or game that makes it begin to move or play.
She hit the gobutton and the robot began to dance.
3. A computer button that starts a program or action.
Click the gobutton to begin the game.
4. A signal or cue that tells people it is time to begin.
The teacher's wave was the gobutton for the race to start.